CN111098591B - Method and device for powdering a sheet in a printing press - Google Patents
Method and device for powdering a sheet in a printing press Download PDFInfo
- Publication number
- CN111098591B CN111098591B CN201911035830.7A CN201911035830A CN111098591B CN 111098591 B CN111098591 B CN 111098591B CN 201911035830 A CN201911035830 A CN 201911035830A CN 111098591 B CN111098591 B CN 111098591B
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- powder
- sheet
- nozzle arrangement
- nozzles
- nozzle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
- B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
- B41F23/06—Powdering devices, e.g. for preventing set-off
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Printing Methods (AREA)
Abstract
The invention relates to a method for powdering a sheet in a printing press by means of a first nozzle arrangement, by means of which powder is applied uniformly distributed over the sheet width, while powder is applied in a regionally variable manner over the sheet width by means of a second nozzle arrangement. Here, the powder applied in the second nozzle arrangement is larger than the powder applied in the first nozzle arrangement in terms of area unit.
Description
Technical Field
The invention relates to a method for powdering a sheet in a printing press by means of a first nozzle arrangement, by means of which powder is applied uniformly distributed over the width of the sheet. The invention also relates to a device for powdering a sheet in a printing press, comprising a first nozzle arrangement with first nozzles and comprising a second nozzle arrangement with second nozzles.
Background
DE 10 2004 057 478 A1 describes a spray bar on which spray nozzles are arranged adjacently. The spray bar is used to dust the printed sheet in a gapless manner.
DE 100 38 774 A1 describes a method for the zoned application of powder to a printing material, in which a locally variable powder supply is carried out. In this way, a print job with a regionally strongly fluctuating coloring job can be provided with a regionally varying powder amount.
DE 10 2008 019 936 A1 describes a powder application device with individually controllable area-type metering elements. In the event of a deviation between the actual density and the target density, the metering element concerned of the powder application region is actuated in a compensating manner. The application density can be varied in the application region in the direction of the sheet travel in accordance with the coloring task (or varnishing task).
EP 2 042 A2 describes a powder application device comprising a first powder application nozzle arrangement with a first powder application nozzle and comprising a second powder application nozzle arrangement with a second powder application nozzle.
Disclosure of Invention
The object of the invention is to provide a further method and a further device for dusting sheets in a printing press.
This object is achieved by a method for powdering a sheet in a printing press by means of a first nozzle arrangement, by means of which powder is applied uniformly distributed over the sheet width, characterized in that at the same time powder is applied in a regionally varying manner over the sheet width by means of a second nozzle arrangement, wherein, with respect to the area unit, more powder is applied by means of the second nozzle arrangement than by means of the first nozzle arrangement.
Different refinements of the method according to the invention are possible:
the powder can be varied by means of the second nozzle arrangement according to the printed image to be dusted on the sheet.
In the case of powder change, in addition to the printed image to be dusted, the printed image on the back side of the sheet can also be taken into account.
To actuate the second nozzle arrangement, the print image data of the prepress stage can be used.
Those nozzles of the second nozzle arrangement that are located within the width of the sheet may be partially deactivated. This means that: one or more of these nozzles, which are located within the width of the sheet, are deactivated and one or more are activated. In this case, those nozzles of the first nozzle array which lie outside the width of the sheet can be deactivated during the layout setting in order to avoid powder waste and machine contamination.
The object is also achieved by a device for powdering a sheet in a printing press, comprising a first nozzle arrangement with first nozzles and comprising a second nozzle arrangement with second nozzles, characterized in that a metering and dispensing system is provided for generating a lower powder concentration in the powder air mixture released by the first nozzles and a higher powder concentration in the powder air mixture released by the second nozzles, and in that each of these second nozzles can be deactivated individually by means of a control device. The metering and dispensing system meters and dispenses the powder such that the powder concentration of the powder air mixture discharged by the first nozzle is lower than the powder concentration of the powder air mixture discharged by the second nozzle. Based on control commands from the operator or based on control commands from the program being run, the control device actuates the second nozzles in such a way that some of them are deactivated.
The improvement is also described in the following examples.
Detailed Description
The powder application device comprises a first nozzle arrangement and a second nozzle arrangement for spraying powder onto printed sheets, which are transported in a direction to a sheet stack. The sheet is transported by chain grippers and runs through these nozzle arrangements during dusting.
These nozzle arrays are each configured as a spray bar. The first nozzle arrangement consists of first nozzles and the second nozzle arrangement consists of second nozzles. A first distributor is connected before the first nozzle arrangement and a second distributor is connected before the second nozzle arrangement. The first powder air mixture flows from the first supply line into the first dispenser and the second powder air mixture flows from the second supply line into the second dispenser. The difference between the first and second powder air mixtures is the powder concentration, the second powder air mixture being of higher powder concentration.
The first distributor is connected to the first nozzle array by a supply line bundle, wherein each supply line leads to a different first nozzle. The second distributor is connected to the second nozzle array by a supply line bundle, wherein each supply line leads to a different second nozzle.
In order to provide different powder concentrations in these supply lines, each supply line may be connected to a different powder meter. Alternatively, a common powder meter for these supply lines may be provided.
A third distributor is connected to this common powder metering device, which divides the total throughput of powder released by the powder metering device into a smaller sub-throughput in the first supply line and a larger sub-throughput in the second supply line.
The powder meter and the third dispenser together form a metering and dispensing system. If two powder meters are provided instead of the common powder meter (one of which is connected to the first supply line and the other to the second supply line), then these two powder meters together form a metering and dispensing system, and a third dispenser is not necessary.
The two sub-throughputs are mixed with pressure air in the supply lines, which are provided for this purpose with an air connection for the pressure air. The proportion of powder in the powder air mixture in the first supply line can be, for example, 8% and can be determined such that it corresponds to the overall "base requirement" of the printed image on the sheet. In this case, the proportion of powder which corresponds to the "base requirement" can be varied from print job to print job depending on the color distribution of the printed image of the respective print job. The proportion of powder in the powder-air mixture in the second supply line can be, for example, 32% and is determined in such a way that it corresponds to the local "tip requirement" of the printed image. This proportion of powder which corresponds to the "tip requirement" can also vary from print job to print job depending on the color distribution.
Not every one of these first nozzles may be individually switched on and off. Only those first nozzles which are located outside the minimum processable format of the sheet (that is to say only those first nozzles which are located in the two end sections of the first nozzle arrangement) can be switched on and off individually. Those first nozzles that are located within the smallest format, that is to say those first nozzles that are located in the middle section of the first nozzle arrangement, cannot be switched individually (or not independently of one another).
Each of these second nozzles may be individually switched on and off. These second nozzles can be adjusted regionally according to the printed image. Those second nozzles that are switched off are located in areas of the printed image where the color distribution and thus the powder demand is smaller. The remaining second nozzles, which are not switched off, are located in the region of high color distribution and high powder demand.
The second nozzle is arranged to spray the powder according to the subject
The powder contour of (a) is applied unevenly across the width of the sheet. In contrast, the first nozzleAlignment applies the powder uniformly across the width of the page. It is also possible to arrange these nozzle arrangements in an interchangeable manner, wherein the sheet is dusted first by the second nozzle arrangement and then by the first nozzle arrangement.
Those first nozzles which are arranged in the end section of the first nozzle array and which can be switched according to the format are provided with switching valves which can be arranged directly on the first nozzles or in the first distributor. Second nozzles that can be switched according to the material are provided with switching valves, which can be arranged directly on these second nozzles or in a second distributor. The switching valves for the first nozzles and the switching valves for the second nozzles may be remotely operated by electronic control means, such as in a control console of a printing press. To this end, the control device may take into account its current prepress stage data. The control means also controls the powder meter.
The printing press can be a front-to-back perfecting press (perfector), in which the sheet to be powdered has a further printed image on the back of the sheet in addition to the printed image on the front of the sheet to be powdered. These second nozzles can be activated and deactivated in dependence on the two print images, i.e. in dependence on the sum of the areal color distribution of the print image and the areal color distribution of the other print image.
In a variant, the second nozzles are not switchable but can be moved along a cross member (Traverse) in a region with increased powder demand and positioned there. The advantage of this variant is that the number of second nozzles can be less than the number of first nozzles.
Claims (6)
1. A method for powdering a sheet in a printing press by means of a first nozzle arrangement, by means of which powder is applied uniformly distributed over the width of the sheet,
it is characterized in that the preparation method is characterized in that,
while the powder is applied by means of a second nozzle arrangement in a regionally variable manner over the width of the sheet,
wherein, with reference to area units, more powder is applied by the second nozzle arrangement than by the first nozzle arrangement.
2. The method of claim 1, wherein the first and second light sources are selected from the group consisting of,
it is characterized in that the preparation method is characterized in that,
the powder applied by means of the second nozzle arrangement varies according to the printed image to be dusted on the sheet.
3. The method as set forth in claim 2, wherein,
it is characterized in that the preparation method is characterized in that,
in the case of a powder change, in addition to the printed image to be dusted, the printed image on the back side of the sheet is also taken into account.
4. The method according to claim 2 or 3,
it is characterized in that the preparation method is characterized in that,
the print image data from the prepress stage is used for controlling the second nozzle arrangement.
5. The method according to any one of claims 1 to 3,
it is characterized in that the preparation method is characterized in that,
partially deactivating nozzles of the second nozzle arrangement located within the width of the sheet.
6. An apparatus for powdering a sheet in a printing press, the apparatus comprising a first nozzle arrangement having first nozzles and comprising a second nozzle arrangement having second nozzles,
it is characterized in that the preparation method is characterized in that,
a metering and dispensing system is provided for producing a lower powder concentration in the powder air mixture ejected by the first nozzle and a higher powder concentration in the powder air mixture ejected by the second nozzle, and
each of the second nozzles can be deactivated individually by the control means,
wherein the apparatus is configured for carrying out the method according to any one of claims 1 to 5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018218454.2 | 2018-10-29 | ||
| DE102018218454 | 2018-10-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111098591A CN111098591A (en) | 2020-05-05 |
| CN111098591B true CN111098591B (en) | 2022-12-13 |
Family
ID=70416933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911035830.7A Active CN111098591B (en) | 2018-10-29 | 2019-10-29 | Method and device for powdering a sheet in a printing press |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111098591B (en) |
| DE (1) | DE102019214114A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4059718A1 (en) | 2021-03-18 | 2022-09-21 | Heidelberger Druckmaschinen AG | Control of powder zones in printing machines |
| CN116001441A (en) | 2021-10-22 | 2023-04-25 | 海德堡印刷机械股份公司 | Spraying device |
| DE102022130821A1 (en) | 2021-12-16 | 2023-06-22 | Heidelberger Druckmaschinen Aktiengesellschaft | pollination device |
| DE102023108713A1 (en) | 2022-05-11 | 2023-11-16 | Heidelberger Druckmaschinen Aktiengesellschaft | Pollination device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10038774A1 (en) | 2000-06-09 | 2001-12-13 | Heidelberger Druckmasch Ag | Printer powder ink air transporter creates flow electrostatically allows local ink deposition |
| DE102004057478B4 (en) | 2004-11-19 | 2009-07-09 | Weitmann & Konrad Gmbh & Co. Kg | Aerosol can and method for dusting of fresh printed products |
| DE102008019936B4 (en) | 2007-05-09 | 2022-08-11 | Heidelberger Druckmaschinen Ag | Arrangement for detecting a structure on a recording medium |
| DE102007046651A1 (en) * | 2007-09-28 | 2009-04-02 | Heidelberger Druckmaschinen Ag | powder device |
| CN105269950B (en) * | 2014-06-20 | 2019-02-15 | 海德堡印刷机械股份公司 | Powder apparatus for printing machine |
| DE102015224490A1 (en) * | 2015-01-22 | 2016-07-28 | Heidelberger Druckmaschinen Ag | Apparatus for powdering printed sheets |
| DE102015014715A1 (en) * | 2015-11-17 | 2017-05-18 | Eltosch Grafix GmbH | Apparatus and method for powdering printed sheets |
| DE102017219710A1 (en) * | 2016-12-06 | 2018-06-07 | Heidelberger Druckmaschinen Ag | Method for spraying printed sheets with powder |
-
2019
- 2019-09-17 DE DE102019214114.5A patent/DE102019214114A1/en active Pending
- 2019-10-29 CN CN201911035830.7A patent/CN111098591B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE102019214114A1 (en) | 2020-04-30 |
| CN111098591A (en) | 2020-05-05 |
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